Rotary pump



J. c. "PACKARD ROTARY rump Filed June 41 1921 2 Sheet s-Sheet 1 Dec. 14 1926. 7 1,610,880

. J. c. PACKARD v ROTARY PUMP Filed June 4, 1921 ZSheets-Sheet 2 a? l;-E

I i v gmmru iw- D 0. Ric/hm atfoz neg Patented Dec. 14, 1926.

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Application filed. June 4;, 1921. .Sefial No. 475,128.

My invention relates to improvements in rotary pumps," my object being to. provide a thoroughly practicable construction of this character and-which shall at the same time be comparatively economical in construction.

Generally speaking the device consists of a casing having formed therein a cylindrical chamber, the casing beingprovided at each end with a crescentshaped member while between these crescent shaped members is an abutment extending the entire lengthof the casing, the crescentshaped members and the abutment being integral with the casing. The abutment divides the inlet compartment from the exit compartment of the cylindrical chamber. Journaled within the heads of this casingis a rotor which is tangential .to the abutment and thus constantly cooperates withthe abut ment and the adjacent portions of the crescent shaped members to divide the inlet compartment from the outlet compartment of the chamber when the pump is in opera tion. "The rotor is provided with pockets in which are mounted buckets which have an oscillatory movement in the pockets, the buckets being so disposed within the pockets and the rotor being so mounted and constructed with reference to the inlet and discharge openings of the casing, that the buckets open on the inlet side and discharge on tile exit side of the chamber. The opening of the buckets is thus automatic and the closing of .the buckets is also automatic, at least'to a certain extent since after having performed their function, they have a tendency to move into the pockets by gravity on the exit sideo'f the chamber, but they are positively moved into the pockets by the crescent shaped members and the abutment to which t-he rotor is tangential as heretofore explained.

Each bucket is provided with an adjustablebrace or keeper which is rigidly connected therewith and which passes through a slot formed in the adjacent part of the rotor, the said brace Or keeperIbeing' provided with an adjustable nut whereby the brace may be made to control the outward movement otthe bucket as desired, otherwise during the liquid lifting movement of thebucket there wou-ld be a tendency -to i'orcethe latter outwardly against the inner wall of the casing tosuch an extent as to produce undue friction. However by means of the brace or keeper connected with eacl bucket the latter may be adjustably controlled as heretofore indicated so that if desired there may be an actual clearance bctween the bucket andthe inner wall of the casing when the bucket is open.

Each bucket is crovidedwith a bearing part which engages theadj accntwall ofthc pocket the said bearings extending beyond the.v buckets both. ends and. being yournaled in discs which are mounted within the casing adjacent the ends of the rotor and between the rotor and the detachable heads of the casing. Further, the body oifthe casing is counterbored at each end. i'forming shoulders which the outer portions of the discs engage, the discs being thus held be tween the shoulders of the cylindricalpart oi": the casing. and the detachable heads of the latter. r f a Having briefly outlined my improvement I will'proceed to describe the same in detail, reference being male to the accompanying drawing in whichnis illustrated anv cmbodiinent thereof.

In this drawing:

Fig. 1 is a detail view of therotor.

Fig. 1 is an end elevation of one form or" bucket. i

Fig. 2 is an elevation of thesame or a view looking in thedirection .ot arrow 2 Fig.1.

' Fig. 3 is an endelevation of one oi the buckets. 7

Fig. 4; is an elevation viewed at angles to -Fig( or a View looking in the L at 0 direction of the arrow. at, i Fig. v3.

Fig. 5 is adetail View of one of the end vdiscscarried by the rotor."

Fig. (dis a section taken on the line 8 6 off Fig.7 is an end elevation partly in section Oli my improved pump, one of the detachableheads of the casing and one of the end discs of the rotor being removed;

:Fig. 8 is a view partly in elevation looking-in the direction of arrow 8, '7, and partly in section taken on the line 8-8 'fl he same reference characters indicate the. same parts in all the Views.

Let the numeralz5 designate the casing of my improved pump consideredin its entirety and composed of a cylindrical member 6 and detachable heads 7 connected with the cylindrical member by suitable fastening devicesas stud bolts 8. Within this casing and formed integral therewith are two ores cent shaped members 9, one being located on each end of the chamber, while extend ng between the central and lower portions of these detachable heads 7, the said heads being provided with stuflin bones 1? whereby tight joints are formet around the journals. This rotor is approximately cylindrical in shape and is centrally mounted in the chamher, being of such size, however, that it is tangential to the abutment l0 and the-adjacent portions of the crescent shaped 111Ql1l-, hers 9, whereby the inlet and outlet con1- partments of the chamber are separated from each other. Within this rotor a number of pockets 18 which are equi-distantly spaced around the rotor and are opento receive buckets 19 which are arranged to oscillate within the said pockets, each bucket having a bearing edge 20 which projects slightly beyond the rotor at bothextremities as shown at 21, these projections being journalled in recesses 22 formed in discs 23, the said discs being secured to the opposite extremities of the rotor by screws or bolts 2% or other suitable fastening device. The cylindrical part 6 of the casing is counterbored at each end as shown at 25, forming shoulders against which the outer portions of the discs 23 bear, the said discs being held in their properpositions by means of ribs 26 formed on the heads 7, the said ribs being arranged in opposing relation to the shoulders formed by the counter-bores 25 in the casing. The discs, however, are

free to move between the ribs 26 and the.

said shoulders during the operation of the pump as they must move with the rotor. The faces of the buckets or the surfaces remote from the bearings 20, are curved as shown at 27 or otherwise suitably shaped.

to act upon the liquid to be handled, while the outer surfaces 28,0f the buckets are curved inwardly slightly from the outer edge 29 of the operating face of the bucket so that the surface 28 shall not conform to the vcurve of the outer surface of the rotor. By virtue of this construction, the edge 29 of the bucket is allowed to swing outwardly into contact with the inner surface of the chamber, just as soon as the face of the bucket leaves the tangential line of the abutinner surface of the chamber and the ment lO, whereas,if the face 28 of the bucket were curved to conform to'the curvature of the rotor, the operating extremity of the bucket could not swing. outwardly into contact with the inner face of the chamber until the entire length of the bucket had passed beyond the tangential-line of the abutment, and as soon as this occurred, the bucket would be thrown suddenly outwardly with a pounding result. By curving the surface 28 of the bucket as heretofore described, 1 avoid this difficulty.

Further, connected with each bucket is a bolt 30 which forms a sort of brace or keeper,.the said bolt passing thru a slot 3 formed in the web of the rotor which separates the pocket 18 from a cavity 32 formed longitudinally through the rotor. To the inner: extremity of the bolt 30 or the extremity which projects into the cavity 32, is applied a nut 33awhich is adjustable on the bolt whichis threaded for the purpose, whereby the outward movement of the bucket toward the inner surface of the casing chamber, may be controlled since th nut forms a stop for said purpose, the width of the slot 31 being less than that of the nut. If desired, this. nut may be so adjusted as to leave a slight clearance between the edge 29 of the; bucket. In the absence of a feature of this character, the pressure of the water upon the face 27 of the bucket would have a tendency to force the latter outwardly against the adjacent surface of the ing whereby a large amount of friction might result.

it should be explained that other means maybe employed to perform this function. For instance, the inner edge 3st of the bucket may be made to engage a lip formed on the rotor whereby the outward movement of'the bucket is predetermined. However, in this structure no adjustment is perniissible hence bolt 30 and the other parts cooperating therewith, are believed preferable. The modified form of construction is, how

ever, shown as it is exceedingly simple and may be found commercially practicable.

, Another important feature of my improved pump, consists in the construction and arrangement of the casing 011 the inlet and discharge sides, whereby both of the openings are large and of rectangular shape so that the least possible resistance is present to the inlet and discharge of the water.

The inlet openin 12 is fully illustrated in Fig. 7, in which the outlet opening 13 is also indicated to some extent since it extends from the dotted line .36 to the bottom Wall 37. By having this opening large and rectangular in shape, as shown in Fig. 8, the water under the propelling action of the buckets, passes freely out of the casing, there being no retarding structure It should, however, be explained that the number of buckets should be such that a bucket in the rear will have passed the top of the inlet opening before the bucket immediately in advance passes beyond the upper part of the discharge opening, since the rear bucket must catch the water on the inlet side at least as early as the bucket in advance reaches the discharge opening of the casing.

Attention is called to the fact that each bucket is provided with one or more openings 38 adjacent the bearing edge 20 which allow the water to circulate freely between the pocket and the chamber outside of the rotor, thus preventing any retarding action due to suction which might offer resistance to the outward movement of the buckets, and further, by allowing the water to enter the pockets, a certain balancing effect is present.

stantial part of the bucket has passed the abutment. As the pressure on the outlet side is considerably greater than that upon the inlet side, it is obvious that this pressure will operate behind bucket 19 to force the buckets out from the pockets.

It will be understood from the foregoing that the pockets 18 extend the entire length of the rotor between the discs 23, and this is also true of the buckets which operate within the pockets.

From the foregoing description the use and operation of my improved rotary pump will be readily understood. Assuming that the parts are assembled as illustrated in the drawing (see Figs. 7 and 8), as the rotor is moved within the chamber of the casing, each bucket, as it passes the tangential line or the line of contact between the rotor and the abutment 10, begins to open and pick up the water on the inlet side of the chamber, and the bucket continues to move outwardly and maintain such a position that its outer edge 29 is sufiiciently close to the inner surface of the casing as to prevent the escape of the water. As the rotor continues its travel, the bucket forces the water between the rotor and the casing forwardly in the direction of arrow at which is the direction of the rotors travel, until the discharge opening 13 is reached, after which there is a tion as soon as the bucket commences to pick 7 up the water on the inlet side of the chamber.

I claim:

1. A rotary pump comprising a casing A enclosing a cylindrical chamber having an abutment, a rotor journaled in the casing and engaging the abutment but leaving a space between the rotor and the casing at all other points, the rotor having pockets, and buckets hingedly connected with the rotor to move in to and out of said pockets, the outer faces of the buckets being curved inwardly to permit them to swing outwardly rapidly for'passing the abutment.

2. In a rotary pump having a casing, a rotor provided with pockets and oscillatory buckets mounted in said pockets. means for admitting to the pockets hydraulic pressure from without the rotor to start said buckets out of the pockets.

3.'In a rotary pump of the character described having an abutment member, a bucket member having a pivotal bearing edge and an operative face, and a passage through said bucket spaced from the operative face more than the width of the abutment.

In testimony whereof Iaflix my signature.

JOHN c, PACKARD. 

